Lafayette, Indiana 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

774
FXUS63 KIND 071905
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
305 PM EDT Thu Aug 7 2025

.KEY MESSAGES...

- Very isolated storms possible through the early evening hours;
  most areas will remain dry

- Patchy fog possible again tonight

- Dry through the weekend, with gradually warmer and more humid
  conditions expected

- Shower and thunderstorm chances return next work week

&&

.SHORT TERM (This evening through Friday)...
Issued at 305 PM EDT Thu Aug 7 2025

A couple of very isolated pop up showers, with a rumble of thunder
possible, have developed across portions of central Indiana this
afternoon, and as we move through sundown, this will remain
possible. The vast majority of the area will remain dry, but will
carry a 15 PoP for isolated thunderstorms until then.

Dry weather is expected overnight, though some slightly more robust
convection is possible in stronger instability to our west, which
may manage to approach our border late. However, forcing is minimal
and timing is unfavorable, while CAMs have also continued to be
uncertain. Will carry a dry forecast tonight and into the day
tomorrow. Though some instability will again develop during the
afternoon Friday, a neutral to subsident column and some modest
convective inhibition should keep a lid on deep, moist convection,
though it may be close, and an isolated pop up would not be
completely shocking in the relatively humid airmass.

Despite more high cloudiness tonight, anticipate at least some
patchy fog late yet again with light to calm winds and plentiful low
level moisture, though any dense fog appears unlikely due to this
additional cloudiness, except perhaps in very favored areas like
river and stream valleys.

Lows overnight will drop to near dewpoints in the mid 60s to around
70. Highs on Friday will again be a bit above persistence as low
level thicknesses continue to slowly increase. Expect highs to top
out in the upper 80s to around 90, pushing max heat index values
into mid 90s in spots.

&&

.LONG TERM (Friday night through Thursday)...
Issued at 305 PM EDT Thu Aug 7 2025

Saturday through Sunday...

The lower level patterns suggest through the weekend that strong
surface high pressure will be anchored east of New England,
dominating the weather across the eastern third of the country,
including Indiana. This will result in continued warm and humid gulf
air arriving in Indiana on southerly winds. Aloft, dry air and
subsidence will be in play, as a strong upper ridge, orgininating
from an upper high over the American southwest will be passing
across the region through the weekend. No forcing dynamics appear
available. Forecast soundings suggest weak capping, and diurnal CU
will be possible. Thus mostly sunny days and mostly clear nights
will be expected. A stray afternoon shower cannot be ruled out
should some updraft break the cap, but this will remain very
isolated and not worthy of a pop mention. Southerly flow will keep
warm and humid air in place over Indiana through the weekend,
resulting in highs in the lower 90s and lows in the upper 60s.

Monday through Thursday...

Little change is suggested within the lower level pattern during
this time as strong surface high pressure remains in place just east
of the Atlantic coast, continuing to dominate the weather across the
eastern half of the nation. Again, warm and humid southerly flow
will persist across Indiana and the Ohio Valley. This will result in
a continuation of the ongoing temperature trends. Aloft, the main
steering currents suggest weak flow from the southern plains flowing
into Indiana before settling on a more zonal flow setting up north
of Indiana, mainly across the upper midwest and Great Lakes. This
suggests a few waves of forcing will be possible, but there is low
confidence in these features for well organized precipition.
Forecast soundings Monday through Thursday do show steep lapse rates
with plenty of CAPE available and less capping present. Thus our
best bet for precipitation will be in the form of diurnal showers
and thunderstorms. For now, pops seem warranted here each afternoon
and evening, but due to low confidence, only low chance pops will be
used due to the expected hit and miss nature of diurnal heating
driven storms.

&&

.AVIATION (18Z TAF Issuance)...
Issued at 117 PM EDT Thu Aug 7 2025

Impacts:

- Fog possible again tonight, primarily at the outlying terminals

Discussion:

Another night of fog is possible at the outlying sites tonight,
primarily HUF/BMG. An increase in high cloud blowoff from convection
to our west may help to limit this, and as a result, have simply
included a TEMPO MVFR fog group in the few hours around daybreak
Friday. Otherwise, VFR conditions will dominate most of the period.

Winds through the period will be less than 10KT, primarily southerly
or southeasterly, with some calm or light and variable winds likely
overnight.


&&

.IND WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

SHORT TERM...Nield
LONG TERM...Puma
AVIATION...Nield